code: def testRingAllReduce(self):
      self._testRingAllReduce(1, 2, [], 1)
      self._testRingAllReduce(1, 2, [8], 1)
      self._testRingAllReduce(1, 2, [4, 4], 1)
      self._testRingAllReduce(6, 1, [8], 1)
      self._testRingAllReduce(1, 8, [32], 1)
      self._testRingAllReduce(1, 8, [120], 1)
      self._testRingAllReduce(2, 8, [7, 13], 1)
      self._testRingAllReduce(2, 8, [8, 8], 2)
      self._testRingAllReduce(2, 8, [8, 8], 4)
  
imports: import time
  import numpy
  from tensorflow.core.framework import types_pb2
  from tensorflow.python.distribute.v1 import all_reduce
  from tensorflow.python.framework import constant_op
  from tensorflow.python.framework import ops
  from tensorflow.python.framework import tensor_shape
  from tensorflow.python.framework import test_util
  from tensorflow.python.ops import array_ops
  from tensorflow.python.ops import math_ops
  from tensorflow.python.ops import state_ops
  from tensorflow.python.platform import test
  from tensorflow.python.platform import tf_logging
label_desc: Use image node_id 9 for calling the AllReduceTest obj's underlying member method code with example usage: obj.testRingAllReduce() without return types